Question Allah is a 'thing' as described in Quran!

Some say that Allah described himself as a 'thing' in the Quran and it seems that they present Quran 6:19 as an evidence:

﴿قُلْ أَىُّ شَىْءٍ أَكْبَرُ شَهَـدةً
.(Say: "What thing is the most great in witness'') (Quran 6:19)

How should a Muslim respond to such understanding?

Quran 6:19 Say: "What thing is the most great in witness'' Say: "Allah is Witness between you and I; this Qur'an has been revealed to me that I may therewith warn you and whomsoever it may reach. Can you verily bear witness that besides Allah there are other gods'' Say "I bear no (such) witness!'' Say: "Only He is God, alone, and truly I am innocent of what you join in worship with Him.'')<!-- google_ad_section_end -->

Some say that Allah described himself as a 'thing' in the Quran and it seems that they present Quran 6:19 as an evidence:

How should a Muslim respond to such understanding?<!-- google_ad_section_end -->

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We also use the word here. For example, it's quite common in my country to say something that if translated to English it would be, "Allah is the only thing that provides" and many other similar statements using "the only thing" and "the only one".

And I'm sure we don't use the word "thing" only after knowing the verse you quoted. It's just... language. It's already there.

Say, “Whose testimony is the greatest?” Say, “Allah is the witness between me and you, and this Qur’an has been revealed to me so that I should thereby warn you, and whomsoever it may reach. Do you really bear witness that there are other gods along with Allah?” Say, “I bear no such witness.” Say, “In fact, He is one God. I disown what you associate (with Him).”

The scholar Abd Allah al-Ghunayman said in his explanation of Kitab at-Tawhid from Sahih al-Bukhari, the chapter of ‘Say: Which thing is greatest as a witness? Say: Allah.’:

Thus Allah, exalted is He, declared himself as ‘a thing’, and the Prophet, peace and blessings of Allah upon him, designated the Qur’an as ‘a thing’. It is an attribute among the Attributes of Allah, as He said: ‘Every thing shall perish except His Face’, meaning by this that Allah has generalized that He is ‘a thing’ and as such are His Attributes. The meaning is not that ‘thing’ is from the Asma’ al-Husna of Allah, rather He, exalted is He, has informed that He is ‘a thing’. As such He has informed about His Attributes that they are ‘things’ since it is correct to say about everything that exists that it is ‘a thing’. Al-Hafidh said: ‘Thing’ is equivalent to ‘existence’, linguistically and customarily, and as for the saying “So-and-so is nothing”, then it is intended from the route of eloquence as a means of disparagement. So due to that he is described with an attribute of ‘nonexistence’.

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Can someone else volunteer for the others?

Edit: The only people I can see this being a problem for are the Mutakallimeen, philosophers, Ashaa'irah, Jahmiyyah, and Mu'attilah. Their eyeballs practically fall out of their heads when they read anything like this...​